Sealed  Mason jars, whether they are heat processed or vacuum sealed, can be  difficult to open. If you use a bottle opener or church key, you risk  denting and damaging the lid. So I wanted to make something with a  longer contact point with the lid to make it safer to use.

Sized to work for both standard and wide-mouth lids, for the standard Ball/Kerr style Mason jar lids.

This  is a pretty trivial design, so do whatever you want with it. I am  including the FreeCAD project in case you want to make any adjustments  (the load point could stand to be adjusted a bit, and I may iterate the  design).

Mason Jar Lid Lifter

Mason Jar Lid Lifter 2024-07-01.stl

Lithium cells are great - high capacity, higher voltage and current than household batteries. But you don't want to just throw a lithium battery in to your bag because they can be a fire risk if shorted.

I saw a simple 18650 holder that was two caps that were held together with elastic bands (https://thangs.com/designer/Nf1nk/3d-model/18650%20holder%20%281%29.stl-861781). However, I also have 21700 batteries, and this one wouldn't work with those. So I whipped up a simple FreeCAD project that could be easily modified for most common sizes.

Print two and insert up to three 21700 batteries. Secure the two caps with hair elastics.

The original on Thangs had no license specified. It's a pretty trivial object so do with it what you will. I am also uploading a version for 18650 batteries.

Minimal 21700 Holder

18650 lithium cells are great - high capacity, higher voltage and current than household batteries. But you don't want to just throw a lithium battery in to your bag because they can be a fire risk if shorted.

I saw a simple 18650 holder that was two caps that were held together with elastic bands (https://thangs.com/designer/Nf1nk/3d-model/18650%20holder%20%281%29.stl-861781). However, I also have 21700 batteries, and this one wouldn't work with those. So I whipped up a simple FreeCAD project that could be easily modified for most common sizes.

Print two and insert up to three 18650 batteries. Secure the two caps with hair elastics.

The original had no license specified. It's a pretty trivial object so do with it what you will. I am also uploading a version for 21700 batteries.

Minimal 18650 Holder

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Mason Jar Lid Lifter

Minimal 21700 Holder

Minimal 18650 Holder